# reactingEulerFoam: Cheking heat and mass balance

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 February 12, 2018, 16:21 reactingEulerFoam: Cheking heat and mass balance #1 New Member   Join Date: Jun 2017 Posts: 11 Rep Power: 7 Hello everyone, I have a question regarding heat and mass balance inside reactingEulerFoam solver. In my model I imposed boiling and condensation conditions at two different boundaries of my geometry. We know that dmdt = iDmdt + wDmdt. That means total phase change is sum of volumetric (interfacial) phase change and phase change that happens at the walls. Therefore, steady state situation happens when dmdt is almost zero, right? As far as I understood, the solver finds those two phase change mass fractions from thermodynamic properties of each phases (enthalpy, saturation temperature, pressure). Therefore, can I assume that the heat balance is conserved when my dmdt is close to zero (when the mass balance is conserved)? If no, how can I check the heat balance conservation? Thanks! roshanak878 likes this.

February 16, 2018, 16:44
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Quote:
 Originally Posted by BarCFD Hello everyone, I have a question regarding heat and mass balance inside reactingEulerFoam solver. In my model I imposed boiling and condensation conditions at two different boundaries of my geometry. We know that dmdt = iDmdt + wDmdt. That means total phase change is sum of volumetric (interfacial) phase change and phase change that happens at the walls. Therefore, steady state situation happens when dmdt is almost zero, right? As far as I understood, the solver finds those two phase change mass fractions from thermodynamic properties of each phases (enthalpy, saturation temperature, pressure). Therefore, can I assume that the heat balance is conserved when my dmdt is close to zero (when the mass balance is conserved)? If no, how can I check the heat balance conservation? Thanks!
Hi
I am working on the same issue when I have boiling and condensation. However, dmdt(total mass transfer ) is decreased but never get zero. also, I calculate heat flux at wall and again it is never getting equal. Do you want to exchange our cases?

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